Interworking: Start ANQP fetch from eloop callback

Reduce maximum stack use by starting next ANQP fetch operation from an
eloop callback rather than calling interworking_next_anqp_fetch()
directly from interworking_start_fetch_anqp(). This avoids issues that
could potentially make the process run out of stack if long loops of
ANQP operations are executed in cases where automatic Interworking
network selection is used and scan results do not have a full match for
a network.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/interworking.c

@@ -2556,7 +2556,12 @@ void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
 		bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;
 
 	wpa_s->fetch_anqp_in_progress = 1;
-	interworking_next_anqp_fetch(wpa_s);
+
+	/*
+	 * Start actual ANQP operation from eloop call to make sure the loop
+	 * does not end up using excessive recursion.
+	 */
+	eloop_register_timeout(0, 0, interworking_continue_anqp, wpa_s, NULL);
 }